lengthwise lettering
Lettering which runs vertically rather than
horizontally on the spine of a bound book. The
lettering generally runs from head to tail so that
it may be read if the book is shelved horizontally
with the upper cover uppermost. Lengthwise
lettering is used for books meant to be shelved
flat. e.g., newspapers. and also on books which
are too thin for across the spine lettering
without undue hyphenation or abbreviation. In the
latter case it is common for library binders to
make an additional charge for the lettering.