Cuemath
Cuemath: Euler's Number
You will learn about Euler's Number with simulations and practice questions. After this lesson, you will be able to easily solve problems on Euler's number value, Euler's number calculator, Euler's number proof, and Euler's number digit.
Wikimedia
Wikipedia: Common Logarithm
Discusses using a table of logarithms before the use of calculators, gives an example of a logarithm and the parts of a logarithm, and also discusses the difference in the way mathematicians and engineers write logarithms.
eFunda
E Funda: Properties of Logarithmic Functions
A list of properties of logarithmic functions. A handy reference tool while working problems.
Other
Principia Cybernetica Web: Logarithm
Short site with links to related sites on the topic of the Logarithm
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: About "E"
This site gives a discussion about e, the base of the natural logarithm. The site contains history of this real number a discussion on the rationality of the number and how to approximate the value of e. The site contains numerous links...
Math Words
Math words.com: Natural Logarithm
A brief explanation for what the natural logarithm is. Shows how to write the natural logarithm of x.