Rubber cultivation for Porto Rico
Contributors: United States. Divison of Botany; United States. Department of Agriculture
Series: Circular / U.S. Dept. of Agriculture. Division of Botany -- no. 28; Circular (United States. Division of Botany) -- no. 28.
Publisher: U.S. Dept. of Agriculture, Division of Botany
Published: 1900
Place of publication: Washington, D.C
Language: eng
Number of pages: 12
Subjects: Rubber; Rubber plants
Notes: Caption title.

Signed: O.F. Cook.

"June 22, 1900."

Division of Botany Circular No. 28.

At head of title: United States Department of Agriculture, Division of Botany.
Table of contents: title: Botanical sources of rubber; title: Para rubber (Hevea brasiliensis). pp. 2.; title: Ceara rubber (Manihot glaziovii). pp. 3.; title: Central American rubber (Castilloa elastica). pp. 4.; title: Rubber culture as an element in mixed farming. pp. 5.; title: Experimental plantings of rubber trees. pp. 7.; title: Harvesting of rubber. pp. 8.; title: Coagulation of rubber. pp. 9.; title: Future of rubber culture. pp. 11.