Biodiversity and Conservation - A Hypertext Book

The origin, nature and value of biological diversity, the threats to its continued existence, and approaches to preserving what is left

Botany Online - The Internet Hypertextbook

Covering all plant anatomy, classic genetics, organic chemistry and plant biochemistry, intercellular communication, interactions between plants, fungi, bacteria, and viruses, evolution, and a part of ecology.

College Physics for Students of Biology and Chemistry

This is a hypertextbook written for first-year undergraduate physics students. It assumes that you have a working knowledge of algebra, that you are currently taking or have taken a college level course in Biology and one in Chemistry, and that you are interested in biology, chemistry or one of the health-related fields.

GetBodySmart

An Online Textbook About Human Anatomy and Physiology

Introduction to Physical Oceanography

Want to contribute? Many of you who are using this material in your classes can write web pages better than I, or you may want to include important new material. Here's your opportunity. I would like to make the textbook an open source document open to contributions from all. If you write a paragraph, subsection or section, I will add it to the book and put your name on the contribution.

Kimball's Biology Pages

Online textbook from Maricopa Community College

Online Biology Book

Web-based reworking of the popular introductory, college-level biology textbook by Kimball