> Please use a ball point pen for all entries, so that the marks will not smear nor will they be erasable.

They just give this. But, there is a lot of interesting discussion about different inks vs pencil for archiving things that I would've loved to read.

Something i was told was to use the lefthand page for rough work, it [leftpage] was to be considered an appendix or attachment of sort and was not considered for scrutiny. it was highly advisable to use pencil on the left page in wet solvent conditions [water, alchohol, benzene etc.]

The right hand side of the note book was a final and standing statement of your notes and was to be indelible ink with bracket and single cross through in the case of transcription errors. the right hand page was the "final answer"

Top of the document says use a ballpoint pen, which doesn't smear and can't be erased like a pencil.

Try some gel ink pens. I'll concede they are awkward to write with without staining the paper with your hand, but they resist almost any common solvent, and can't be erased by cherrypickers.