I found an ad for a painting by Kirk. It includes a booklist. However, the list does not go up to 50 - so I managed to find just enough titles to supplement the list. They are:

The Princess and the Goblin by George MacDonald (ed. 1907)
Moufflou and Other Stories by Ouida (ed. 1910)
Bimbi Stories by Ouida (ed. 1910)
Frank & Bessie's Forester by Alice Lounsberry (ed. 1912)
Little Pierre and Big Peter by Ruth Ogden (ed. 1915)
The Little Lame Prince by Dinah Mulock Craik (ed. 1918)
Gulliver's Travels by Jonathan Swift (simplified, 1918)
Gritli's Children by Johanna Spyri (ed. 1924)

Here's the ad:

"Portrait of a Gentleman"

https://www.ebay.com/itm/275009202343?mkevt=1&mkpid=0&emsid=e11021.m43.l1120&mkcid=7&ch=osgood&euid=2d09027820a54bd89da3ed196b8b48e3&bu=43017261725&ut=RU&exe=99322&ext=234173&osub=-1%7E1&crd=20211101072516&segname=11021&sojTags=ch%3Dch%2Cbu%3Dbu%2Cut%3Dut%2Cnqt%3Dnqt%2Cnqc%3Dnqc%2Cmdbreftime%3Dmdbreftime%2Ces%3Des%2Cec%3Dec%2Cexe%3Dexe%2Cext%3Dext%2Cexe%3Dexe%2Cext%3Dext%2Cosub%3Dosub%2Ccrd%3Dcrd%2Csegname%3Dsegname%2Cchnl%3Dmkcid

The rest, below, is from the ad.

About the Artist:

Maria Louise Kirk (21 June 1860 – 21 June 1938), usually credited as M. L. Kirk or Maria L. Kirk, was an American painter and illustrator of more than fifty books, most of them for children.
Her notable work includes illustrations for a US edition of Alice's Adventures in Wonderland in 1904, for the first edition of The Secret Garden, and for several books by L. M. Montgomery and Johanna Spyri.

Born in Lancaster, Pennsylvania, Kirk studied art in Philadelphia at the School of Design for Women and then at the Pennsylvania Academy of the Fine Arts, She had exhibitions around Pennsylvania and won awards in Philadelphia and Chicago. In the 1890s, she went on to study at the Art Institute of Chicago and in 1894 won the Mary Smith Prize of the Pennsylvania Academy of the Fine Arts, for a portrait.

During her career, Kirk illustrated more than fifty books, including an American edition of Alice's Adventures in Wonderland in 1904. Her style is individual, little influenced by the Jugendstil or Art Deco movements.

Although she was a talented artist, with so much published work, little is known about Kirk's life.

In 2009, the Folio Society of London used Kirk’s illustrations for its new edition of At the Back of the North Wind.

List of books illustrated:

Kate Upson Clark, That Mary Ann: the Story of a Country Summer (Boston: D. Lothrop Co., 1893)[7]
Theodora R. Jenness, Piokee and Her People (Boston: D. Lothrop Co., 1894)
"Pansy", Pansy's Sunday Book: For afternoon readers :gems of literature and art, with numerous illustrations (Boston: Lothrop Publishing Co., 1896)
Lewis Carroll, Alice's Adventures in Wonderland (New York: Frederick A. Stokes Co., 1904)[2]
George MacDonald, At the Back of the North Wind (Philadelphia: J. B. Lippincott & Co., 1904)[2]
Ouida, A Dog of Flanders, the Nürnberg Stove, and Other Stories (Philadelphia: J. B. Lippincott & Co., 1909)
George Daulton, The Helter Skelters (New York: Frederick A. Stokes Co., 1909)
Adelheid Wette, translated Norreys J. O’Conor, Hänsel and Gretel: a fairy opera adapted from the libretto (New York: Frederick A. Stokes Co., 1909)
Jean Ingelow, Mopsa the Fairy (Philadelphia: J. B. Lippincott & Co., 1910)[2]
Favorite Rhymes of Mother Goose (New York: Cupples & Leon, 1910)[2]
Winston Stokes, The Story of Hiawatha, Adapted from Longfellow by Winston Stokes (New York: Frederick A. Stokes Co., 1910)
Hans Christian Andersen, Tales from Hans Andersen (Philadelphia & London: J.. B. Lippincott & Co., 1911)
Frances Hodgson Burnett, The Secret Garden (New York: Frederick A. Stokes Co., 1911)[2]
Fergus Hume, Chronicles of Fairyland (Philadelphia & London: J. B. Lippincott & Co., 1911)
Sara Tawney Lefferts, ed., Land of Play: Verses, Rhymes and Stories (Cupples & Leon Co., 1911)
All Shakespeare's Tales: Tales from Shakespeare by Charles and Mary Lamb, and Tales from Shakespeare by Winston Stokes (New York: Frederick A. Stokes Co., 1911)[8]
Inez N. McFee, The Story of Idylls of the King, adapted from Tennyson, by Inez N. McFee, with the original poem (New York: Frederick A. Stokes Co., 1912)[9]
Clayton Edwards, The Story of Evangeline, Adapted from Longfellow. With the Original Poem (New York: The Hampton Publishing Co., 1913)
Mrs Molesworth, The Cuckoo Clock (J. B. Lippincott & Co., 1914)
F. J. Harvey Darton, The Story of the Canterbury Pilgrims Retold from Chaucer and Others (J. B. Lippincott & Co., 1914)[2]
George MacDonald, The Princess and Curdie (1914)[2]
Johanna Spyri, Heidi (Philadelphia: J. B. Lippincott & Co., 1915)[2]
Emma C. Dowd, DOODLES the Sunshine Boy (Grosset & Dunlap, 1915)
Lucy Maud Montgomery, Anne's House of Dreams (Toronto: McClelland, Goodchild, & Stewart, 1917)[10]
Stella George Stern Perry, The Angel of Christmas: a vision of to-day (New York: Frederick A. Stokes Co., 1917)
Charles Kingsley, The Water Babies (J. B. Lippincott & Co., 1918)[2]
Miss Mulock, The Adventures of a Brownie (Philadelphia: J. B. Lippincott & Co., 1918)
Emma C. Dowd, Polly and the Princess (Boston: Houghton Mifflin, 1917)
Lucy Maud Montgomery, Rainbow Valley (Toronto: McClelland & Stewart, 1919; New York: Frederick A. Stokes Co., 1919)[10]
Robert Louis Stevenson, A Child's Garden of Verses (Philadelphia & London: J. B. Lippincott Co., 1919)
Carlo Collodi, Pinocchio: The Story of a Puppet (Philadelphia & London: J. B. Lippincott & Co., 1919)[2]
Johanna Spyri, Cornelli (Philadelphia & London: J. B. Lippincott & Co., 1920)
John Ruskin, The King of the Golden River, and Dame Wiggins of Lee and her seven wonderful cats (Philadelphia: J. B. Lippincott & Co., 1921)
Lucy Maud Montgomery, Rilla of Ingleside (Toronto: McClelland & Stewart, 1921)[10]
Johanna Spyri, Mäzli : a story of the Swiss valleys (New York, 1921)[11]
Johanna Spyri, Vinzi: a Story of the Swiss Alps (J. B. Lippincott & Co., 1923)
Lucy Maud Montgomery, Emily of New Moon (Toronto: McClelland & Stewart, 1923; New York: Frederick A. Stokes Co., 1923)[10]
Johanna Spyri, Dora (Philadelphia & London: J. B. Lippincott & Co., 1924)
Lucy Maud Montgomery, Emily Climbs (New York: Frederick A. Stokes Co., 1925)
Lucy Maud Montgomery, Emily's Quest (New York: Frederick A. Stokes Co., 1927)
Johanna Spyri, Moni, the Goat Boy (Philadelphia: J. B. Lippincott & Co., 1927)
A. C. Darby, Skip-come-a-Lou (New York: Frederick A. Stokes Co., 1928)
George MacDonald, At the Back of the North Wind, illustrated by Maria L. Kirk (London: Folio Society, 2009)