Close To Finishing One Room

As you can see in the photos I am getting close to having all the floor boards off. I tried to capture the amount of grit and dust accumulation in the tongues and grooves. The house was built in 1910 so thats what? 110 years approx. of stuff making its way into the small cracks between boards. It is caked on up to about 1/16 of an inch and has to be scraped repeatedly with a paint scraper to get it of. You can see the scraper in the photo as it slides along the tongue.