https://www.skyharbor.com/About/Development/PHXSkyTrainstage2
This is a link to the Phoenix Sky Harbor Airport website for the PHX Sky Train Stage 2 project, which is the subject of Project and Concrete Bridge Technology articles on pages xx and 34.

https://ascelibrary.org/doi/abs/10.1061/%28ASCE%29BE.1943-5592.0001551
This is a link to purchase Construction and Field Evaluation of Electrically Isolated Tendons in a Prestressed Concrete Spliced Girder Bridge. The system was installed in the Coplay- Northampton Bridge, featured in a Project article on page 20.

https://www.ocapa.net/assets/EIC_2019_folder/2019_EIC_Projects_PDFs/US30%20%20Mosier%20Dry%20Canyon%20%20Chenoweth%20Creek%20Bridges.pdf
This is a link to a presentation on the rehabilitation of the Dry Canyon Bridge, which is featured in a Concrete Bridge Preservation article on page 38.

https://www.wesavestructures.info
The Concrete Preservation Alliance website provides information on realkalization, which is discussed in the Concrete Bridge Preservation article on page 38.

https://www.fhwa.dot.gov/hfl/projects/ut_grs-ibs_i84_saltlakecity.pdf
This is a link to Utah Demonstration Project: Geosynthetic Reinforced Soil Integrated Bridge System on I-84 near Salt Lake City—Draft Report. The project was the first use of a geosynthetic reinforced soil-integrated bridge system (GRS-IBS) on a U.S. interstate. See the State article on page 42.

https://www.fhwa.dot.gov/publications/research/infrastructure/structures/bridge/17080/17080.pdf
This is a link to the FHWA report HRT-17-080 Design and Construction Guidelines for Geosynthetic Reinforced Soil Abutments and Integrated Bridge Systems. GRS-IBS is discussed in the State article on page 42.

https://www.youtube.com/watch?v=N3j8ATiqcAs&index=1&list=PL5_sm9g9d4T3ymcxjfVEdYnd2-Hj-Fozl&t=0s
This is a link to Replaceable Grouted External Post-Tensioned Tendons, a video by the Federal Highway Administration. The topic is the subject of the FHWA article on page 46.

https://store.transportation.org/item/collectiondetail/202
This is a link to information on the new 9th edition AASHTO LRFD Bridge Design Specifications. The revised column tie spacing requirement is discussed in the LRFD article on page 53.