What is one way that historians can establish the authenticity of a primary source

Comparing the dating of paper to the date it happened (it should be very close)
Making sure the writing style is relevant to the date it was thought to be (yes, writing styles can change over the time) 

hope this helps

Towns and small farms are usually for land, lakes, rivers, and seas.they also produce other food, like crops.it's also where animals are, where we get our meat.large plantations normally have forests, where crops are grown for sale. (similar to farms)plantations have larger fields of crops.our wine, sugar canes, and fruits come from plantations.