mudamanu:
<font color="blue">I am interested in learning about soil, crops, livestock, general farming, etc. </font>
I have a rather extensive library myself (6000+ vols) of which about 350 volumes are devoted to agriculture, horticulture, animal husbandry, etc. If your interest is general and if are interested in working a small acreage you might look at Five Acres and Independence by M. G. Kains. This realistic and hardheaded guide was originally published in the 1930s it has been reprinted and updated. Most recently it was reprinted by Dover. If you are interested in agricultural issues, the USDA yearbooks are good (the older ones). I have about 60 going back to 1862 (when the USDA was started). The best are the ones published in the early 1900s up into the early 1920s. You get enough information on a number of topics in each issue without overkill. Also, MacMillan published a series called Rural Textbook Series (edited by L H Bailey-many written by G F Warren) covering a number of topics. The best single volume is titled Farm Management by G F Warren. I have the 1921 edition.
I disagree (respectfully of course) with cowboydoc's comments IF your desire is general understanding and general principles. If you need to have the latest thinking and research on growing a specific crop in a specific location he is, of course, correct. But the principles of agriculture have changed little. From your post, it seems you are interested in the general principles. You can even go back to Cato's De Agri Cultura (On Agriculture) published around 175 BC and you will understand more about hard headed principles of running a farm than most farmers today (available in the Loeb classical library in Latin with English translation-it is in print today). If you want specific information about a topic you can zero in on that later-for example, Plant Propagation in Pictures by Montague Free was published in 1957-you'll learn more about the subject than all but a professional botanist.
Go to your public library and ask them to point you to the Dewey 636 section.
Anyway, good luck. The above titles will give you a good overview of the general principles of the subject.
JEH