Farmers Bulletin #1500. The one we've all heard about. It's not too hard to find.
The below can be found here.
Rammed Earth Walls for Buildings: Farmers Bulletin 1500 ... This is the great 1926 edition with photos, drawings and complete low tech construction information on rammed earth. The US Government produced this booklet as a series, to show farmers and poor rural folks how to build a house from earth (pise' de terre). Praises rammed earth over cob for ease of construction. The building information, tools and formworks description needed for manual wall building are ideal for anyone wanting to learn this method. 26 pages, xerographic, b&w photos of houses and tools, formwords, plus sketches throughout. A very thorough little guide! #2012...$6.00
Rammed Earth Walls for Farm Buildings-1933, Bulletin 277 South Dakota State College. 67 pages, xerographic. This book extensively explores the soils and methods used for successful RE construction. Covers many plaster and finishing tests, with recommendations for lime, asphalt, cement "cream" and lindseed oil. Provides charts on aggregates % in soil for best compression, and other useful construction information from footings to roof. The Ag. Dept. built an experimental poultry house and recorded all experiments thoroughly to inform others on sucessful RE building. This booklet refers to #2012 Rammed Earth Walls, shown on the Adobe page, and to Ellington's "Modern Pise Buildings" from 1923 (see above). The photos are very poor due to xerography, but the text information is most valuable for anyone wanting to avoid problems during manual rammed earth building. 67 pages, booklet, xerographic, b/w photos and drawings. #277...$12.00