TO THE 90TH ANNIVERSARY OF PROFESSOR G.I. RYCHAGOV

Abstract

Collective of authors – colleagues, friends, followers and students of MSU Department of Geography, members of RGS, staff of RAS Geomorphological Department, and members of RAS Geomorphological Commission and editorial board of Geomorfologiya (Geomorphology RAS) Journal congratulate one of the masters of Russian geomorphology – Georgiy I. Rychagov – with his 90^th anniversary.