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Per Ardua ad Astra: Seventy Years of the RFC and the RAF: Amazon.co.uk: Donne, Michael, Fowler, Cynthia: 9780584110227: Books
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Per Ardua ad Astra: Handbook of the Royal Air Force: Amazon.co.uk: Congdon, Philip: 9781853104787: Books
![CWGC Engraving of RFC Emblem and Motto – Per Ardua ad Astra (Through Adversity to the Stars) – Real Lives CWGC Engraving of RFC Emblem and Motto – Per Ardua ad Astra (Through Adversity to the Stars) – Real Lives](https://reallives.blog/wp-content/uploads/2018/10/CWGC-Engraving-of-RFC-Emblem-and-Motto-Per-Ardua-ad-Astra-Through-Adversity-to-the-Stars.jpg)
CWGC Engraving of RFC Emblem and Motto – Per Ardua ad Astra (Through Adversity to the Stars) – Real Lives
![ROYAL AIR FORCE below gilt & blue crest & motto PER ARDUA AD ASTRA, with or w/o printed "ribbon" - TuckDB Ephemera ROYAL AIR FORCE below gilt & blue crest & motto PER ARDUA AD ASTRA, with or w/o printed "ribbon" - TuckDB Ephemera](https://images.tuckdb.org/ephemera/images/000/023/192/extra_large/t.jpg)
ROYAL AIR FORCE below gilt & blue crest & motto PER ARDUA AD ASTRA, with or w/o printed "ribbon" - TuckDB Ephemera
![Royal Canadian Air Force Emblem - Eagle Rampant Maple Leaf - Motto Per Ardua Ad Astra - Air Forces Memorial Runnymede Stock Photo - Alamy Royal Canadian Air Force Emblem - Eagle Rampant Maple Leaf - Motto Per Ardua Ad Astra - Air Forces Memorial Runnymede Stock Photo - Alamy](https://c8.alamy.com/comp/B7T41P/royal-canadian-air-force-emblem-eagle-rampant-maple-leaf-motto-per-B7T41P.jpg)