degradation

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On a disease of olive and orange trees, occurring in California in the spring and summer of 1875
W. G. Farlow

American Journal of Science July 1876, s3-12 (67) 37-45; DOI: https://doi.org/10.2475/ajs.s3-12.67.37
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On the geology of the delta and the mud lumps of the passes of the Mississippi
E. W. Hilgard

American Journal of Science June 1871, s3-1 (6) 425-435; DOI: https://doi.org/10.2475/ajs.s3-1.6.425