TY  - BOOK
AU  - Burkhardt, M. R.
CN  - I 19.76:
CY  - Denver, Colo. :
DA  - 1995.
ID  - 196051
KW  - Water
N1  - Distributed to depository libraries in microfiche.
N1  - Shipping list no.: 97-0849-M.
PB  - U.S. Dept. of the Interior, U.S. Geological Survey :
PB  - Earth Science Information Center, Open-File Reports Section [distributor],
PP  - Denver, Colo. :
PY  - 1995.
T1  - Methods of analysis by the U.S. Geological Survey National Water Quality Laboratorydetermination of methylene blue active substances by spectrophotometry /
TI  - Methods of analysis by the U.S. Geological Survey National Water Quality Laboratorydetermination of methylene blue active substances by spectrophotometry /
ER  -