Queen's Gambit Declined, Exchange Variation

How the Queen's Gambit Is Played as a Chess Opening - dummies

opening - In the Queen's Gambit Declined, why is 5.e3 so much more popular than 5.Nf3 after 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7? - Chess Stack Exchange

Queen's Gambit Accepted, 3.e4

Where do I place my white bishop in queens gambit declined? : r/chess

Queen's Gambit Declined Orthodox Variation: A Chess Works

Queen's Gambit Declined This Land Press - Made by You and Me

Reykjavik Open 2018: Nihal Sarin shocks Ahmed Adly, R

Netflix's 'The Queen's Gambit' sparks chess frenzy, websites register millions of new players - The Economic Times

Is there any gambit in chess, besides the queen's gambit, that is

Queen's Gambit Declined: Vienna – Everyman Chess