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diff --git a/us_noaa/README.us_noaa b/us_noaa/README.us_noaa
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--- a/us_noaa/README.us_noaa
+++ b/us_noaa/README.us_noaa
@@ -5,6 +5,20 @@ from [US NOAA](https://www.ngs.noaa.gov)
## Included grids
+### USA: NAD27 -> NAD83
+
+*Source*: [.los/.las files coming from NOAA](https://www.ngs.noaa.gov/PC_PROD/NADCON/NADCON.zip)
+*Format*: GeoTIFF converted from CTable2
+*License*: Public Domain
+
+* alaska.tif - Alaska
+* conus.tif - Conterminous U.S.
+* hawaii.tif - Hawaii
+* prvi.tif - Puerto Rico, Virgin Is.
+* stgeorge.tif - St. George Is, Alaska
+* stlrnc.tif - St. Lawrence Is., Alaska
+* stpaul.tif - St. Paul Is., Alaska
+
### USA: NAD83 -> NAD83 (HARN/HPGN)
*Source*: [.los/.las files coming from NOAA](https://www.ngs.noaa.gov/PC_PROD/NADCON/NADCON.zip)
@@ -22,6 +36,14 @@ Those files have been converted to NTv2 grids with the
* *hpgn.tif (51 files)
+Also include a few files which are duplicate of *hpgn.tif files, for historic reasons:
+
+* FL.tif - Florida
+* MD.tif - Maryland
+* TN.tif - Tennessee
+* WI.tif - Wisconsin
+* WO.tif - Washington, Oregon, N. California
+
### Continental USA VERTCON: NGVD (19)29 height to NAVD (19)88 height
*Source*: converted from [NOAA VERTCON .94 grids](https://www.ngs.noaa.gov/PC_PROD/VERTCON/)