Ritchie, Anna,  1943- <br/><br/>
The ancient monuments of Orkney / 
Anna Ritchie and Graham Ritchie ; series editor David J. Breeze. 
 - 2nd ed. 
 - Edinburgh :  HMSO,  1986. 
 - 72p. 
<br/><br/> At head of title: Historic Buildings and Monuments, Scottish Development Department. 
<br/><br/><label>ISBN: </label>0114924783