Kitabu hiki huenda hakitapatikana katika uchapishaji.

AIB no. 99
24 pages, illustrated, photos
Personal study by the author in 1938-1939, studying the record of agriculture in countries wehre the land had been under cultivation for hundreds or thousands of years.
Maelezo ya Uchapishaji
- Limechapishwa: 2000
- Mchapishaji: U.S. Dept. of Agriculture, Soil Conservation Service
- Dewey Decimal: 630
- Maktaba ya ECHO: 630 USD