You can certainly leave them as is. Remove the tack strip and the thousands of staples the carpet layers used to fasten down the rebond pad. Use a colored putty to fill the larger nail holes from the tack strip. Depending on the age of the house and those floors, they may have a myriad of finishes used in different areas and at different times. For many years, shellac and wax were the preferred treatment (1st part of the 20th century) but in the 50's, newer products became available. Acid-cured urethane commonly known as Glitsa was developed in Sweden for lino but quickly became favored for wood in certain parts of the country. Oil modified urethanes were being developed (remember Flecto Varathane with the girl on the can roller skating). That was made in the 50's as well, along with lacquers like DEFT and moisture cured urethanes as well. So your floors have a "sealer" of sorts as all wood floors are finished prior to being put into use. Also, a few finishers liked the penetrating oil finishes like Watco and Dura Seal. To be on the safe side, clean the floors well using Trewax Wood Cleaner and when dry, the re-wax with Trewax brand Paste Wax.
http://www.trewax.com/woodcare.html#wood04
This is for a much older floor. If the floor is newer, it may have a poly finish only, in which case you could just clean it well and apply another coat of poly, after proper preperation.
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