NASA - Data from Chandra Observatory on dense matter.
Google - Research database allows searching of the scholarly literature.
F. Senese, Frostburg State U. - From General Chemistry Online, a summary of Dalton's work.
J. Park, ChemTeam - An excellent tutorial on early atomic theory.
F. Senese, Frostburg State U. - From General Chemistry Online: elements, mixtures, and compounds.
M. Gleiser - A short essay on the origin of matter from the PBS program Stephen Hawking's Universe.
Illustrations formatted for printing on transparencies or displaying with a projector
An alphabetical glossary of relevant scientific terms.
J. Dalton - 1808 paper introducing his chemical theory.