Zen yang gai zao di chan tian
By: Guangdong sheng nong ye ke xue yuan bian
Edition: Di 1 ban
Publisher: Guangdong ren min chu ban she; Guangdong sheng xin hua shu dian fa xing
Published: 1973
Place of publication: [Canton]
Language: chi
Number of pages: 47
Subjects: Soil productivity
Notes: Colophon title.