If you do not have a Google account, but do have a local account, you can still log in:
Forgot your password?
Create an account
Gupta S., . (2002). CONCEPT OF MODERN PHYSICS. N.DELHI: DHANPAT RAI & CO. (P) LTD.
Gupta S.L, . 2002. CONCEPT OF MODERN PHYSICS. N.DELHI: DHANPAT RAI & CO. (P) LTD.
Gupta S.L, . CONCEPT OF MODERN PHYSICS. N.DELHI: DHANPAT RAI & CO. (P) LTD. 2002.