Emilio BIEL
Eduardo Beira e J. M. Lopes Cordeiro
Biel, Arte e natureza em Portugal (fotos)
Vol. 1 - https://archive.org/details/gri_33125000176566
Vol. 2 – https://archive.org/details/gri_33125000176491
Vol. 3 - https://archive.org/details/gri_33125000176558
Vol. 4 - https://archive.org/details/gri_33125000176327
Vol. 5 - https://archive.org/details/gri_33125000176343
Vol. 6 - https://archive.org/details/gri_33125000176541
Vol. 7 - https://archive.org/details/gri_33125000176533
Vol. 8 - https://archive.org/details/gri_33125000176350/page/n159/mode/2up
Fotos UP (agosto 2019) (album)
Eduardo Beira (coordenação, ed.)
A linha do Tua, 1887, e as fotografias de E. Biel
ISBN 978-989-98659-4-5, 2014 (FOZTUA project) (144p.)
(pdf)
Lopes Cordeiro,
Emilio Biel: o empresário que fotografava obras de engenharia (p. 35-42) (pdf)