Open Access河北省石家庄市负离子浓度分布与旅游资源引力分析<br>Anion Concentration Distribution and Tourism Resources Gravity Analysis in Shijiazhuang
Author(s) -
蔡 贝克
Publication year - 2013
Publication title -
huan jing bao hu qian yan
Language(s) - English
Resource type - Journals
eISSN - 2164-5485
pISSN - 2164-5493
DOI - 10.12677/aep.2013.32007
Subject(s) - tourism , environmental science , geography , archaeology