TY  - BOOK
AU  - Yan,Haowen
AU  - Yang,Weifang
TI  - Surveying: principles and methods 
SN  - 9781842657201
PY  - 2012///
CY  - Beijing, China
PB  - Science Press
KW  - Surveying
KW  - Textbooks
N1  - Includes bibliographical references
ER  -