TY  - RPRT
TI  - Calibration of secondary standard magnetic tape cassettes (computer amplitude reference) phase I 
AU  - Geller, Sidney B
PY  - 1972
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS TN 731
DO  - 10.6028/NBS.TN.731
ER  -