TY  - BOOK
AU  - Forster, Robert B.
AU  - Sherrin, Lise
TI  - Determination of unknown variables in compound rate of change problems 
U1  - 634.9 21st ed.
PY  - 1969///
CY  - Ottawa
PB  - Forest economics research Institute
KW  - Forests and Forestry-Comuter Programs, Ratio analysis
N1  - a computer oriented approach
Information Report e-x-2
ER  -