- US. Heybroek, H. M., Goudzwaard, L, Kaljee, H. (2009). Iep of olm,
karakterboom van de Lage
Landen (:Elm, a tree with
character of the Low Countries)...
- ISSN 0083-7792. Heybroek, H. M., Goudzwaard, L, Kaljee, H. (2009). Iep of olm,
karakterboom van de Lage
Landen (:Elm, a tree with
character of the Low Countries)...
- S2CID 34278784. Heybroek, H. M.; Goudzwaard, L.; Kaljee, H. (2009). Iep of olm,
karakterboom van de Lage
Landen (Elm, A Tree With
Character of the Low
Countries (in...
- de/handbuch/ulmus Heybroek, H. M., Goudzwaard, L, Kaljee, H. (2009). Iep of olm,
karakterboom van de Lage
Landen (:Elm, a tree with
character of the Low Countries)...
- 109–1276. H. M., Heybroek; L, Goudzwaard; H.,
Kaljee (2009). Iep of olm,
karakterboom van de Lage
Landen (:Elm, a tree with
character of the Low Countries)...
- 2011. Heybroek, H. M., Goudzwaard, L, Kaljee, H. (2009). Iep of olm,
karakterboom van de Lage
Landen (:Elm, a tree with
character of the Low Countries)...
- resista-ulmen.com Heybroek, H. M., Goudzwaard, L, Kaljee, H. (2009). Iep of olm,
karakterboom van de Lage
Landen (:Elm, a tree with
character of the Low Countries)...
- 98-99 [1] Heybroek, H. M., Goudzwaard, L, Kaljee, H. (2009). Iep of olm,
karakterboom van de Lage
Landen (:Elm, a tree with
character of the Low Countries)...
- S2CID 7520439. Heybroek, H. M., Goudzwaard, L, Kaljee, H. (2009). Iep of olm,
karakterboom van de Lage
Landen (:Elm, a tree with
character of the Low Countries)...
- met
nieuwe én oude iepen. p. 14. Heybroek, H. M. (2009). Iep of olm :
karakterboom van de lage
landen (in Dutch). Zeist: KNNV. ISBN 978-90-5011-281-9. "Вяз...