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| -rw-r--r-- | README.md | 1 |
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@@ -5,6 +5,7 @@ This repository contains the source for the following two books: * The Definitive Guide to GTFS (2014) * The Definitive Guide to GTFS-realtime (2015) +These books have been written by Quentin Zervaas. These were originally published commercially, but have now been donated to [MobilityData](https://mobilitydata.org/). Some of the content may be outdated. You are encouraged to contribute any fixes or changes in order to keep it as up-to-date as possible. |