Just for contrast, here's a one-room school house in Davisville, very close to Hopkinton, NH, where A Buss from Lafayette is set. Note the separate entrances for boys and girls. By the way, my 8th grade teacher (the one who met Geronimo as a little girl) started her teaching career at one room school houses very much like this one.
Here is "Augustus Prescott" showing us a slate board, used by pupils to write classroom exercises.
Here's what Clara says about slate tablets like this one:
"I liked everything about school, right down to the
sound of the pencils scritching on our slate tablets."
- A Buss from Lafayette © 2016 by Dorothea Jensen
The re-enactors at the Monadnock Center for History and Culture said that in the winter, children would bring a potato from home to bake in the stove that heated the classroom. Each potato would be marked with the child's name.