CORBETT, BERTHA L. The Sun-bonnet Babies. Minneapolis, 1900. Illustrated by Corbett. Oblong 8vo, original pictorial green boards, backstrip defective, corners a little worn. FIRST EDITION. Laid in: Autograph letter signed to Mr. Grover (brother of later collaborator Eulalie Osgood Grover?), mentioning his sister and sending "the drawings, adding the 'overall boy' as you suggested..." Minneapolis, 8 January 1902. 1 1/2 pages, oblong 12mo, on letterhead paper -- [CORBETT, illustrator]. GROVER, EULALIE OSGOOD. The Sunbonnet Babies' Primer. Chicago, [1902]. 8vo, original pictorial cloth, rubbed. FIRST EDITION -- [CORBETT, illustrator]. GROVER. The Overall Boys. Chicago, [1905]. 8vo, original pictorial beige cloth. FIRST EDITION, with the Handbook for Teachers by Grover laid-in -- [CORBETT, illustrator]. The Sunbonnet Babies at Work at Play. Chicago, n.d. Oblong 4to, original pictorial wrappers, worn. (4)