Avery's collection of Spanish children's drawings of the civil war consist of 153 drawings made by children aged 7 to 14 between the years 1936 and 1938. The drawings were willed to the Department of Art History and Archaeology of Columbia University by Martin Vogel, a lawyer, who died on May 20, 1938 at the age of 59. He made several bequests to Columbia University in a will dated March 16, 1938. From the date of this will and of his death, it is likely the drawings he purchased were those exhibited at Lord & Taylor's in February 1938. His name, however, does not appear among the patrons of the exhibition.