diff --git a/bibliography.adoc b/bibliography.adoc
index 8bb74fc1..926e1b0d 100644
--- a/bibliography.adoc
+++ b/bibliography.adoc
@@ -16,7 +16,7 @@ OGC document 12-063. 1st May 2015.
 - [[[OGP-EPSG_GN7_2]]]  link:$$http://www.epsg.org$$[OGP Surveying and Positioning Guidance Note 7, part 2: Coordinate Conversions and Transformations including Formulas].
 - [[[SCH02]]] C Schaer, D Leuenberger, and O Fuhrer. 2002. {ldquo} A new terrain-following vertical coordinate formulation for atmospheric prediction models {rdquo}.
 _Monthly Weather Review__.  130. 2459-2480.
-- [[[Snyder]]]  link:$$https://pubs.er.usgs.gov/publication/pp1395$$[Map Projections: A Working Manual]. USGS Professional Paper 1395.
+- [[[Snyder]]]  link:$$https://doi.org/10.3133/pp1395$$[Map Projections: A Working Manual]. USGS Professional Paper 1395.
 - [[[UDUNITS]]]  link:$$http://www.unidata.ucar.edu/software/udunits/$$[UDUNITS Software Package].  UNIDATA Program Center of the University Corporation for Atmospheric Research.
 - [[[W3C]]]  link:$$http://www.w3.org/$$[World Wide Web Consortium (W3C)].
 - [[[XML]]]  link:$$http://www.w3.org/TR/1998/REC-xml-19980210$$[Extensible Markup Language (XML) 1.0]. T. Bray, J. Paoli, and C.M. Sperberg-McQueen.  10 February 1998.