7 public-domain matches
Background Noise
Sources and levels of background noise in the NASA Ames 40- by 80-foot wind tunnel
HARLIE 3-D Aerosol Backscatter and Wind Profile Measurements During Recent Field Experiments: Background Noise Reduction with a Fabry-Perot Etalon Filter in the HARLIE System
Current Background Noise Sources and Levels in the NASA Ames 40- by 80-Foot Wind Tunnel: A Status Report
Background noise levels measured in the NASA Lewis 9- by 15-foot low-speed wind tunnel

Notes on nursing
The Story of Mankind