TY  - RPRT
TI  - QADATA user's manual; an interactive computer program for the retrieval and analysis of the results from the external blind sample quality- assurance project of the U.S. Geological Survey
AU  - K.J. Lucey
PY  - 1990
DO  - 10.3133/ofr90162
UR  - https://pubs.usgs.gov/publication/ofr90162
ID  - ofr90162
ER  -