Man pages matching name lsmem in section 1:

lsmem.1.de	debian 10 / manpages-de
lsmem.1.en	debian 10 / util-linux
lsmem.1.de	debian 11 / manpages-de
lsmem.1.en	debian 11 / util-linux
lsmem.1.de	debian 12 / manpages-de
lsmem.1.uk	debian 12 / manpages-uk
lsmem.1.en	debian 12 / util-linux