Environmental Research Satellite (English Wikipedia)

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astronautix.com

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Krebs, Gunter D. "TRS Mk. 1 (ERS)". Gunter's Space Page. Retrieved 25 October 2021.
Krebs, Gunter D. "TRS Mk. 2 (ERS)". Gunter's Space Page. Retrieved 25 October 2021.
Krebs, Gunter D. "ORS Mk.2 (ERS)". Gunter's Space Page. Retrieved 25 October 2021.
Krebs, Gunter D. "ORS Mk.3 (ERS)". Gunter's Space Page. Retrieved 25 October 2021.
Krebs, Gunter D. "OV5 (ERS)". Gunter's Space Page. Retrieved 25 October 2021.
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