This manual is concerned with the methods of waterproofing all types of soil construction.The first and easiest way to obtain a waterproofing agent from a tree is through Its sap. Since many trees will not have a free flowing sap, and many that do not have useful sap, all kinds of trees must be tested.
A VITA Publication
11 pages, illustrated
- 出版者: Volunteers in Technical Assistance,
- Dewey Decimal: 691.99
- ECHO 图书馆: 691.99 BOA