Campbell and Lehr provided in 2021 another of his earlier textbooks of possible interest, pursuant to his intent expressed in a recent publication (here). The text, Water Well Technology, was first published in 1973 and had 12 printings over 14 years with a distribution of more than 40,000 copies worldwide. The first systematic study of water well technology and of the environmental concerns of the day.
A 2nd Edition is currently being considered by the authors.