Links to book sitesCollecting Books & Magazines is a great resource for collectors of children's books. Based in Australia, there are pages on many of the most popular authors from the UK, Australia and the USA.
The New Chalet Club has everything you could want to know about EBD and her books, together with quizzes, places to ask questions and information on joining the club.
Friends of the Chalet School has similar information.
The Abbey Chronicle (UK Elsie Jeanette Oxenham Appreciation Society) has FAQs, articles from past Chronicles and information on joining.