I had the chance to stumble on two late 50s John Deere tractors that where still functional and that marked the end of an era. It is a comprehensive farm sound library that is not just about tractors or animals.
You will find, in the bonus section, 6 different footsteps surfaces each with a walk and run variation and some more. There are five main categories in this library: Ambiances, Animals, Footsteps, Misc (Various SFX) and Vehicles ready for creating a convincing farm soundscape for your project.