Re: 1901 30-40 Krag Value?
First, this is not my strong field of expertise.
Second, very nice rifle, in an overall condition not usually seen outside of collections today.
Third, do not do any more than wipe it down good with an oily cloth; and do do so to remove loose rust and stop its growth.
Forth, it looks like you have an Model 1898 Rifle (nominal 30"barrel) and not the more valuable 22" barrel carbine. Even so, this rifle will likely fetch over $1000 USD.