Conservation is a key word on the home front these days. Every civilian is conserving rubber, home equipment, farm machinery and energy. He must latch the doors of waste.
Brown, Elfriede F.
"Conserve the Nutrients,"
Farm Science Reporter: Vol. 4
, Article 8.
Available at: https://lib.dr.iastate.edu/farmsciencereporter/vol4/iss1/8