Hydraulic Principles James W. Etchison Airlines War Training Institute Wash. DC 1942 Prepared for aircraft flight and grown crews Illustrated by Joe Chris Smith Paper bound 8 1/2 X 11 inches 115 pages This is a text and workbook with problems to solve See my other on Hydraulic principles Condition: Light soil and small rubs on the corners and edges. Postage: Media mail. Canada and overseas, please ask for a quote. Some Highlights: WE ARE GLAD TO ANSWER ANY QUESTIONS! We are glad to combine postage. Paper items are put between cardboard. We ship world-wide. PAYMENT- We accept money orders, personal checks, Google Checkout, Paypal. CONDITION- Our scanner makes colors a little lighter. We have lightly tinted windows, which may alter the colors slightly when we use a camera. Vintage items will show some age, and we will try to note any and all defects. An item described, as "excellent", can be perfect or have minor flaws, from age, and that I feel any collector would be glad to have. If you have any question on condition, please ask.