BB#7 was written in Rio de Janeiro in 1942.
Thesis: Jardim, Gil, and Olivier Toni. 2002. Bachianas brasileiras nð 7: o estilo antropofágico de Heitor Villa-Lobos.
You can listen to BB#07 in streaming audio, part of this concert from CBC Radio Two.
2 Flutes +1 picc, 2 oboes +1 English Horn, 2 Clarinets +1 Bass Clarinet, 2 Bassoons +1 Contra Bassoon - 4 Horns, 3 Trumpets,4 Trombones,1 Tuba - Timpani, 3 Percussion players (tam-tam, xylo, coco {coconut shell}, bombo {BD}) Harp, Celesta, Strings.
This comprehensive listing of Bachianas Brasileiras scores from the Major Orchestra Librarians' Association website contains lots of useful information.
There are 17 performances of the BB#07 in the Villa-Lobos Concerts database as of May 2009.