Carl G. Hempel
wrote Aspects of Scientific Explanation: And Other Essays in the Philosophy of Science
comprising 504 pages back in 1970.
Textbook and eTextbook are published under ISBN 0029143403 and 9780029143407.
Since then Aspects of Scientific Explanation: And Other Essays in the Philosophy of Science textbook
was available to sell back to BooksRun online for the top buyback price
or rent at the marketplace.
A classic statement of a logical empiricist (LE) account of explanation - LE being the dominant philosophy of science in the middle part of the 20th century, and still influential today in some of the "aspiring" sciences (such as experimental psychology and economics). It is clear and readable, and worth reading to see where later accounts of scientific explanation either draw their inspiration or are reacting (negatively) to.