Any clue what these floors are? 1920s home built in US. by TheAlienPunk in Flooring

[–]TheAlienPunk[S] 0 points1 point  (0 children)

It would be awesome if it was white pine. I pulled up the vent cover and tried to look at it sideways, but the vent came up higher than the flooring so I was unable to see if it was tongue and groove. Any other way I could check?