A&M is short for Texas A&M University. The A&M stands for agricultural and mechanical. It's located in College Station, Texas.
Trust me, you likely would not have liked Harlow, particularly if you were female. He had a bias towards women for some reason. He knew his material, but he was short with people and had no problem dressing you down in public.
I'm willing to bet that they still require his book for the introduction to construction class.
Here's a used copy on Amazon. https://www.amazon.com/Landscape-Architecture-Construction-Harlow-Landphair/dp/B005YVLZRW/ref=sr_1_1?keywords=harlow+landphair&qid=1565577476&s=books&sr=1-1