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[O. V. Christensen Recording Rainfall]
Photograph of O. V. Christensen recording rainfall as it has been collected in a device in his yard.
Date:
1985
Creator:
unknown
System:
The Portal to Texas History
[O. V. Christensen Recording Temperature]
Photograph of O. V. Christensen looking inside a white box where a device records the temperature.
Date:
1985
Creator:
unknown
System:
The Portal to Texas History