Houghton Mifflin Co. Texts unmarked, though there are former ownership signs (signs of sticker removal on spines, top corner of front free endpapers clipped out, possibly from a personal library). Covers have some rubbing and wear. No dates on title pages, copyright pages show only dates from 1870s, though these may be later. Vol 3 has a light dampstain to tail edge of textblock near spine; page surfaces don't appear stained but slight cockling nonetheless.
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