I have two very old Hardcover textbooks regarding Hydraulice.
1) 1926-1929 Hydraulic Laboratory Practices (868 pages). Copyright 1929.
Some wear and tear visible on the binding where cloth has separated from the book structure.
2) Hydraulic Structure Volume II (1172 pages plus Index) Copyright 1937
Both are in very nice condition on the pages considering the age of these two textbooks.
There is evidence that possibly they had slight water or moisture damage as some sections of the book are rippled but not stained and no signs of mold or anything.
Selling for $30.00 each or both for $50.00 firm