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This page from the GeoTech Center provides a link to an introductory textbook on Geographic Information Systems, or GIS. The textbook is freely available online. The text covers a general introduction to GIS, vector data, vector attribute data, data capture, raster data, topology, coordinate...

This resource, made available by EETech Media, LLC., is an online textbook that provides "a series of volumes covering electricity and electronics." The textbook is divided into six volumes: Direct Current (DC), Alternating Current (AC), Semiconductors, Digital, Reference, and Experiments. Each...

This resource, made available by EEtech Media, LLC., is the first in a series of six online textbooks about electric circuits. This book covers direct current (DC) and includes 17 chapters: Basic Concepts of Electricity, Ohm's Law, Electrical Safety, Scientific Notation and Metric Prefixes, Series...

This resource, made available by EEtech Media, LLC., is the second in a series of six online textbooks about electric circuits. This book covers alternating current (AC) and includes 15 chapters: Basic AC Theory, Complex Numbers; Reactance and Impedance -- Inductive; Reactance and Impedance --...

This resource, made available by EEtech Media, LLC., is the third in a series of six online textbooks about electric circuits. This book covers Semiconductors and includes 14 Chapters: Amplifiers and Active Devices, Solid-state Device Theory, Diodes and Rectifiers, Bipolar Junction Transistors,...

This resource, made available by EEtech Media, LLC., is the fourth in a series of six online textbooks about electric circuits. This book covers digital circuits and includes 17 chapters: Numeration Systems, Binary Arithmetic, Logic Gates, Switches, Electromecahnical Relays, Ladder Logic, Boolean...

This resource, made available by EEtech Media, LLC., is the fifth in a series of six online textbooks about electric circuits. This book functions as reference material that features information such as equations, laws, conversions, derivatives (etc). Chapters of this book include: Useful Equations...

This resource, made available by EEtech Media, LLC., is the sixth in a series of six online textbooks about electric circuits. This book features laboratory style activities and includes 9 chapters: Introduction, Basic Concepts and Test Equipment, DC Circuits, AC Circuits, Discrete Semiconductor...

This 136-page AP Environmental Science Textbook is provided by the University of California College Prep. "This text is designed to acquaint students with the physical, ecological, social, and political principles of environmental science. Scientific method is used to analyze and understand the...

This web page, created by Hugh Jack of Grand Valley State University, provides free links to a 35-chapter text currently being used in an undergraduate controls course. The course and book focus on the Allen Bradley family of controllers, allowing for deeper coverage of the topic than most PLC...