Linked from
The 50 pages that link to Logarithm, each with the reason it gives.
pHNarrower topic: The base-10 logarithm makes each pH unit correspond to a tenfold activity change.
Natural logarithmNarrower topic: The natural logarithm is the logarithm with the particular base e.
Common logarithmNarrower topic: Common logarithms are the base-10 members of this broader family.
Binary logarithmNarrower topic: Binary logarithm is one member of the broader family of logarithms.