Plate A3.1 Divers practise underwater survey techniques during a NAS Part I course. (Photo: Mark Beattie-Edwards)
9781405175913_7_Plates 5/7/08 6:30 PM Page 30
Plate A3.1 Divers practise underwater survey techniques during a NAS Part I course. (Photo: Mark Beattie-Edwards)
9781405175913_7_Plates 5/7/08 6:30 PM Page 30