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Here is a nice copy of Introduction to the Differential Equations of Physics by L. Hopf 1948 Paperback. There is some cover wear and the front plastic laminate on the paper is coming loose at the bottom. The inside is pristine except for the typical ex. library markings. There is a stamp that shows the book was acquired by the library in 1966, this book could have been new (produced) then, or an older copy donated at that time.
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