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they are simple and to the point. Best of all they are cheap! I own several of their books.
egs-msu Praise God, He gave me the knowledge to help others! My swaying blog, Trivers Willard hypothesis blog/ diet In-gender lifer
ok I see on their website they aren' that cheap. Make sure you buy it off of amazon used. I just got one on grafting for a 1.95. I paid that for my other books as well