TY  - BOOK
AU  - Hedeman, E. Ruth
TI  - Evolutionary charts of solar activity (calcium plages) as functions of heliographic longitude and time, 1964-1979
PY  - 1981///
CY  - Boulder, Colorado
PB  - U.S. Department of Commerce, National Oceanic and Atmospheric Administration, Environmental Data and Information Service, World Data Center A for Solar-Terrestrial Physics, NOAA
ER  -