Blackwell Publishing
Publishers of Geology Today and many other journals and books.

Mineral Gallery
Online mineral gallery where you can purchase specimens.

Baldwin's Scientific Books
over 350,000 second hand and antiquarian books, journals, offprints and maps for sale. Claiming to be the leading secondhand book dealer in the UK for Palaeontology, Geology and Earth Science, the company also covers all science subjects.

York Survey Supply Centre
manufacturers and suppliers of survey markers and surveying accessories, with over 5,000 products available for on-line ordering. There's also a "tips and tricks" page, providing tips on a range of surveying techniques.