i asked openai to find the rest of this map of the pelham bay area that showed up on an X post

Getting your Trinity Audio player ready…

Below is everything you need to retrieve the complete sheet that your scan comes from, plus adjacent sheets if you want to keep going.

1 What this fragment actually is

Sheet title: “The district of Pelham Neck, within the borough of the Bronx, with Pelham Manor, and New Rochelle to Mamaroneck, together with the islands in the Sound adjoining – Map VII B.”
Publication: Indian Paths in the Great Metropolis by Reginald Pelham Bolton (Museum of the American Indian, Heye Foundation, 1922; map artwork © A. R. Ohman Map Co., 1912).
Context: Map VII was issued in four quadrants (A, B, C, D) to cover the entire modern Bronx and a slice of southern Westchester. Your picture is the lower-centre of quadrant B. (The red numbers 22-25 are Bolton’s catalogue of Native-American stations; “Laaphawachking” is the Siwanoy placename for today’s Split-Rock-Pelham Bay area.) (Digital Collections)

2 Direct, high-resolution source (best option)

NYPL scanned every sheet individually:

NYPL Digital Collections permalink
https://digitalcollections.nypl.org/items/fd701400-d044-0138-05f6-5764fcf1c756 (Digital Collections)

Open the link (NYPL occasionally blocks hot-linking; copy–paste the URL into a new tab if necessary).
Click “Download Options → Original” for a ~60 MB TIFF (over 10,000 px on the long side).
Your partial scan fits roughly the central third of that file; the TIFF shows everything north to the Yonkers line and east to Davenport Neck.

3 Alternate, whole-book PDF (if you’d like the other quadrants too)

Internet Archive / Smithsonian Libraries hosts a full-colour, 375-page PDF of Bolton’s monograph that includes all eight maps bound in after the text:

https://archive.org/download/indianpathsingre01bolt/indianpathsingre01bolt.pdf (Internet Archive)

Map VII B is the eighth PDF page after the textual page numbered 112 (roughly PDF p. 150).
Zoom to at least 200 % before exporting a snapshot; resolution is lower than NYPL but still serviceable for on-screen study.
The adjoining sheets are just a few pages farther on: VII A (north-west Bronx), VII C (Harlem River–Kingsbridge), VII D (Throgs Neck).

4 Commercial re-prints / quick previews

If you need an instant look without downloading huge files, these water-marked previews work:

Alamy stock image (medium-res JPEG preview): https://www.alamy.com/the-district-of-pelham-neck-within-the-borough-of-the-bronx-with-pelham-manor-and-new-rochelle-to-mamaroneck-together-with-the-islands-in-the-sound-adjoining-map-vii-b-1912-by-ar-ohman-map-co-image633310789.html (Alamy)
Picryl mirror of NYPL scan: https://picryl.com/media/the-district-of-pelham-neck-within-the-borough-of-the-bronx-with-pelham-manor-and-new-rochelle-to-mamaroneck-together-with-the-islands-in-the-sound-adjoining-map-vii-b-1912-by-ar-ohman-map-co (no water-mark, ~4 MP) (Picryl)

5 Tips for stitching or printing

NYPL and Internet-Archive scans are public-domain; you may crop, stitch, or print without restriction.
For wall display at 300 dpi: the NYPL TIFF will comfortably print at ~34 × 26 in (86 × 66 cm) without up-scaling.
If you’d like the entire four-quadrant Map VII seamless, load the four NYPL TIFFs into QGIS or any image-manipulation program and align them using the neatline ticks in the margins.

Enjoy exploring the complete Siwanoy landscape!