Scale 1:20,000. Title in lower margin: Calcasieu Pass. Facsimile. "American Revolution Bicentennial, 1776-1976." "Date of first publication 1889." Depths shown by soundings and contours. "BiC-56." Includes tide information. Available also through the Library of Congress Web site as a raster image. AACR2
U.S. Coast And Geodetic Survey; Tittmann, O. H. (Otto Hilgard); National Ocean Survey
<a rel="nofollow" class="external free" href="https://www.loc.gov/item/80691506/">https://www.loc.gov/item/80691506/</a>