FOR OUR BHD PROJECT IN UGANDA WE HAVE USED THE TECHNOLOGY OF INTERLOCKING COMPRESSED EARTH BLOCKS. WE FOUND A VERY USEFUL EARTH BLOCK MANUAL CALLED:
MANUAL OF DESIGN AND CONSTRUCTION
by Hubert Guillaud, Thierry Joffroy,
Pascal Odul, CRATerre- EAG
YOU CAN FIND IT PUBLISHED ON THE ECOHABITAR WEBSITE AS A PDF DOCUMENT: http://www.ecohabitar.org/wp-content/uploads/2012/01/04-5793-1.pd.