A new Deep Purple photobook will be published in the course of this year.
The pix were taken by Barry Plummer, who worked for Melody Maker and accompanied the band on the British tours between 1971 and 1974.
The statement says the book will be 'reasonably' priced, whatever that means. But it's definitely on my shopping list. 
http://stereo33books.com
QuoteIn the meantime the photo above comes from the band’s one and only Mk 3 UK tour in 1974, a lengthy series of dates designed to introduce the new singer and bassist, David Coverdale and Glenn Hughes respectively. Barry spent part of the show up in the gods, getting this great view of the band and a very enthusiastic crowd.
