Crowdsourcing Geographic Knowledge girro 2014年1月9日 11 阅读 0 评论 未分类 Crowdsourcing Geographic Knowledge: Volunteered Geographic Information (VGI) in Theory and Practice Hardcover: 393 pages Publisher: Springer (January 01, 2012) Language: English ISBN-10: 9400745869 ISBN-13: 9789400745865 代发服务PDF电子书10元立即求助