Visual observations of the lunar libration clouds and an observing ephemeris.
Lunar libration clouds visual observations and observing ephemeris, discussing sightings from aircraft and photographic attempts
Krumm, W. J.↗
Engineering topics
Krumm, W. J.
Publications and source records attributed to Krumm, W. J..
Visual observations of lunar libration center clouds
Lunar libration center clouds indicated by luminosity observations
Allen, W. H.↗