Земсков А.И. & Евстигнеева Г.А.

Антропогеновый период (1)

Richard M. Stapleton & Patricia Hemminger, Ph.D. & Susan L. Senecah, Ph.D. (...)

Hydrogeology (1)

Dinah Zike & Ralph M. Feather Jr., PhD & Susan Leach Snyder (...)

Stratigraphy (1)

Rhonda Pfaff & Bob Booth & Jeff Shaner & Scott Crosier (...)

Страноведение (1)