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Interior detail of 55-gallon water filled drums that form the core of the passive solar heating system of this home near Corrales, New Mexico... 04 1974
UMG22A38_484

Interior detail of 55-gallon water filled drums th...

Active and passive grindstones
UMG21A16_307

Active and passive grindstones

Active and passive grindstones, From back to front: Las Palas Plane (El Almanzora Caves, province of Almeria, Andalusia) and Los Murcielagos Cave (Zuheros, province of Cordoba, Andalusia); Unknown ori...
UMG20B24_371

Active and passive grindstones, From back to front...