Fa 

1. "Dune", J. C., Lieut. Col., Corps of Engineeros. Co n c re t e mix er. 
,,':! Notes to accompany the drawing sent to Office of the Chief of 
engineers, 
with letter dated November 18th, 1871. Mit 1 Taf. 
(Ohne Angabe des Druckortes.) 1871.