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Title supplied by cataloger. Typed caption on back: "On cold nights the temperature may often be kept above the danger point by the use of hundreds of heaters, using principally crude oil, placed between the rows." No. 10 in series. Written in pen on back: "Oranges - California." Stamped on back: "This photograph is our file copy do not mutilate it. Please return as soon as possible Philadelphia Commercial Museum. 1310 3." Written in pencil on back: "FN-32483" Smudge pots at work to keep orange trees from freezing in an orchard , General Subjects Photography Collection, PC-GS-Agriculture-Oranges-Cultivation , California Historical Society, PC-GS_00115
chs:410 local: PC-GS_00115
Agriculture Citrus fruit industry Agricultural implements