Other
Witold Lutoslawski, Composer
This bio is relatively short but has many good details, plus a link to reviews of his Symphony No. 4.
University of Michigan
University of Michigan: Instrument Encyclopedia: Clarinet
This article, providing general information on the clarinet -- "a very popular woodwind instrument which originated in Islamic and Asian countries" -- includes an image of a clarinet, several references for reading and research, and a...