Really good books. The Grassland Management book has a 1950 copyright. The Soils book has a 1939 copyright (this edition was reprinted in 1979).
Some of the references are from pre 1900, but the information in these books is still very much valid. (With only a few small exceptions, like the use of DDT as an insecticide and kudzu for erosion control....). They cover all manner of erosion issues, the causes, solutions, preventions..... both are very informative and very interesting. (in my opinion, obviously...) They are also actually relevant to the Great Plains region.
The table of contents pictured is from the Soils book.