What does Walker stand for?

Walker's Michigan Chancery Reports - A publication (DLA)

Walker's Pennsylvania Reports - 1855-85 - A publication (DLA)

Walker's Reports - 1 Mississippi - A publication (DLA)

Walker's Reports - 96, 109 Alabama - A publication (DLA)

Walker's Reports - 22-25, 38-51, 72-88 Texas - 1-10 Civil Appeals Texas - A publication (DLA)