Подземна река (Bulgarian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Подземна река" in Bulgarian language version.

refsWebsite

Global rank Bulgarian rank

6^th place

11^th place

1books.google.com

3^rd place

10^th place

7^th place

31^st place

791^st place

1,251^st place

low place

low place

archive.org

William Herbert Hobbs, Earth Features and Their Meaning: An Introduction to Geology for the Student and the General Reader, Macmillan, 1912, pages 182 and 189.

books.google.com

William B. White and David C. Culver (eds), Encyclopedia of Caves, 2nd ed, Academic Press, 2012, ISBN 0-12-383833-9, p. 468.

csmonitor.com

Kirk, Donald. Seoul peels back concrete to let a river run freely once again // World>Asia Pacific. The Christian Science Monitor, 13 октомври 2005. Посетен на 21 август 2006.

gov.ph

www.gov.ph

nytimes.com

Revkin, Andrew C. Rolling Back Pavement to Expose Watery Havens // New York Times. 16 юли 2009. Посетен на 16 март 2010.