Exploring the world of plants & soils :
plant growth factors.
APA Citation
Colorado State University. Cooperative Extension Service. (1974). Exploring the world of plants & soils: plant growth factors. [Chicago, Ill.]: [National 4-H Council].
MLA Citation
Colorado State University. Cooperative Extension Service. Exploring the World of Plants & Soils: Plant Growth Factors. [Chicago, Ill.]: [National 4-H Council], 1974.
Warning: These citations may not always be complete (especially for serials).