
by Karl Groos

by António Aurélio da Costa Ferreira

by Mary Scharlieb, Frederick Arthur Sibly

by James Sully

by William T. Preyer

by Sanford Bell

by American Institute of Child Life

by E. R. (Elsie Riach) Murray, Henrietta Brown Smith

by Antoinette Abernethy Lamoreaux

by Josephine Siebe

by F. D. (Frederick Douglas) How

by H. Addington (Henry Addington) Bruce