Texas School for the Blind and Visually Impaired has put together a selection of braille resources for people who are new to the field or who need a refresher at the start of the new school year. The following resources are available to download for free:
Braille Handbook for Nemeth Code of Braille Mathematics and Scientific Notation, 1972. Edna Laudenslager, San Francisco State College.
Braille Readiness Grid from Center for the Visually Impaired
Braille Rules - Appendix Braille FUNdamentals