Both of these organisations and a third, Open Morris, also run occasional workshops and instructionals where you can learn the dances. Contact them for further details. Most of the 'traditional' dances and some descriptive material are included in a booklet by the late Dave Jones. This has been out of print but some copies are now available again from the Morris Ring. There is a wealth of descriptive material on Border Morris in collections at the County Record Offices of Shropshire, Herefordshire and Worcestershire.
Descriptions also appear in periodicals of the period.
Once again, the County Record Offices are good starting points, as is the collection in the British Library at Colindale. Sources of Border Morris Dance Notation on the Web Mike Miller's Hounds Dance Pages document our own dances as well as some that we've learned from other teams. See also the tune notation pages here on the Hounds web site. Many of the notes have been published for workshops or lectures which Roy has given or attended. Roy's Border Morris notes are the most extensive collection of traditional and modern border dances.