Math 51: Linear Algebra - Levandosky $90 - Has a little bit of writing but still is very good condition.

http://www.bkstr.com/webapp/wcs/stores/servlet/CourseMaterialsResultsView?catalogId=10001&categoryId=9604&storeId=10161&langId=-1&programId=562&termId=100025341&divisionDisplayName=Stanford&departmentDisplayName=MATH&courseDisplayName=51&sectionDisplayName=01&demoKey=d&purpose=browse

Math 53: $150 - Like new. Differential Equations: An Introduction to Modern Methods and Application by Boyce and Brannan.

http://www.bkstr.com/webapp/wcs/stores/servlet/CourseMaterialsResultsView?catalogId=10001&categoryId=9604&storeId=10161&langId=-1&programId=562&termId=100025341&divisionDisplayName=Stanford&departmentDisplayName=MATH&courseDisplayName=53&sectionDisplayName=01&demoKey=d&purpose=browse

Bio 101: Ecology - Michael Cain $40 - 1st Edition. Like New. Will still work for the class next year. Offer Autumn Quarter.

http://www.bkstr.com/webapp/wcs/stores/servlet/CourseMaterialsResultsView?catalogId=10001&categoryId=9604&storeId=10161&langId=-1&programId=562&termId=100024991&divisionDisplayName=Stanford&departmentDisplayName=BIO&courseDisplayName=101&sectionDisplayName=01&demoKey=d&purpose=browse

Bio 113: Both books for the class:Population Genetics: A Concise Guide by John-H-Gillespie 2nd and Fundamentals of Molecular Evolution by Wen-Hsiung Li 2nd. = $60

http://www.amazon.com/dp/B0028I53UY and http://www.amazon.com/Population-Genetics-John-H-Gillespie/dp/0801880092/ref=sr_1_2?s=books&ie=UTF8&qid=1354052853&sr=1-2&keywords=population+genetics