The Southwestern Historical Quarterly, Volume 66, July 1962 - April, 1963 Page: 452
Fig. 1. Topographic map of the apex of the
Big Bend, summer of 1921. Contour interval two
feet. Scale: 1 inch -200ooo feet. Reduced from
original base map offered in testimony in which
i inch = 500 feet.
Stippled area represents substantially bare
sand bed, or "sand flat," of river, which-except
for low, incipent islands-was covered with wa-
ter by every slight flood. Each such flood reduced
the whole river bed to quicksand and caused
greater or less change in the position of the low-
water channel at "normal" stage.
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Texas State Historical Association. The Southwestern Historical Quarterly, Volume 66, July 1962 - April, 1963, periodical, 1963; Austin, Texas. (texashistory.unt.edu/ark:/67531/metapth101196/m1/452/ocr/: accessed September 30, 2016), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; crediting Texas State Historical Association.