The collection is arranged into three parts. Part 1 was lent to the Archives of American Art in 1964 by Clay Spohn, and was microfilmed and returned to Spohn. Part 2 was donated to the Archives of American Art by Urban Neininger in 1978 and was partially microfilmed. Because material from part 2 was not processed until over three decades after filming Part 1, the overall organization is inconsistent. In general, material within folders is arranged chronologically.