Background of the Wild Flower Preservation Society
Series 1. Administrative. 1917-1974
Series 2. Percy L. Ricker. 1917-1951
Series 3. Correspondence. 1960-1972
Series 4. Subject Files. 1917-1974
Series 5. Publications. 1923-1960
Series 6. Manuscripts. undated
Series 7. Photographs. undated
Series 8. Photographs and Negatives. 1917-1974