The production of hyacinth bulbs /
by David Griffiths.
- Washington D.C. : U.S. Dept. of Agriculture, 1930.
- 35 p. : ill. ; 23 cm.
- Circular / United States Department of Agriculture ; no. 112 .
- Circular (United States. Department of Agriculture) ; no. 112. .
Caption title. "Contribution from Bureau of Plant Industry."