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Vahtra, Helis (author)
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1
book article
Ehitusmaavarade levik ja maardlate iseloom [Võrguteavik]
Vahtra, Helis
;
Reinsalu, Enno
Ehitusmaavarade uuringu- ja kaevandamisalade korrastamise käsiraamat
2017
/
lk. 46-54 : fot
http://www.ester.ee/record=b4764891*est
https://www.digar.ee/arhiiv/nlib-digar:332505
https://digi.lib.ttu.ee/i/?9461
book article
2
book article
Kaevandite sulgemine ja korrastamine [Võrguteavik]
Vahtra, Helis
;
Reinsalu, Enno
Ehitusmaavarade uuringu- ja kaevandamisalade korrastamise käsiraamat
2017
/
lk. 109-111 : fot
http://www.ester.ee/record=b4764891*est
https://www.digar.ee/arhiiv/nlib-digar:332505
https://digi.lib.ttu.ee/i/?9461
book article
3
book article
Karbonaatkivimid [Võrguteavik]
Reinsalu, Enno
;
Vahtra, Helis
Ehitusmaavarade uuringu- ja kaevandamisalade korrastamise käsiraamat
2017
/
lk. 28-30 : ill
http://www.ester.ee/record=b4764891*est
https://www.digar.ee/arhiiv/nlib-digar:332505
https://digi.lib.ttu.ee/i/?9461
book article
4
book article
Maavara (ava)kaevandamise viisid ja tehnoloogilised protsessid [Võrguteavik]
Toomik, Arvi
;
Reinsalu, Enno
;
Vahtra, Helis
Ehitusmaavarade uuringu- ja kaevandamisalade korrastamise käsiraamat
2017
/
lk. 67-73 : fot
http://www.ester.ee/record=b4764891*est
https://www.digar.ee/arhiiv/nlib-digar:332505
https://digi.lib.ttu.ee/i/?9461
book article
5
book article
Purdsetted [Võrguteavik]
Reinsalu, Enno
;
Vahtra, Helis
Ehitusmaavarade uuringu- ja kaevandamisalade korrastamise käsiraamat
2017
/
lk. 30-36 : fot
http://www.ester.ee/record=b4764891*est
https://www.digar.ee/arhiiv/nlib-digar:332505
https://digi.lib.ttu.ee/i/?9461
book article
6
book article
Puuraukude sulgemine ja korrastamine [Võrguteavik]
Vahtra, Helis
;
Vahtra, Helis
Ehitusmaavarade uuringu- ja kaevandamisalade korrastamise käsiraamat
2017
/
lk. 111-115 : fot
http://www.ester.ee/record=b4764891*est
https://www.digar.ee/arhiiv/nlib-digar:332505
https://digi.lib.ttu.ee/i/?9461
book article
7
book article
Ülekaevandamine, seadusandlusest tulenevad nõuded ja karistused Oorema IV kruusakarjääri näitel [Võrguväljaanne]
Mikko, Anni
;
Grossfeldt, Gaia
;
Vahtra, Helis
Mäendus
2014
/
lk. 246-250 : ill
http://www.ene.ttu.ee/maeinstituut/kogumik/2014/Maendus_2014_Maeinstituut.pdf
book article
Number of records 7, displaying
1 - 7
author
11
1.
Vahtra, Helis
2.
Vahtra, A.
3.
Vahtra, E.
4.
Vahtra, H.
5.
Vahtra, J.
6.
Vahtra, Katre
7.
Vahtra, Milvi
8.
Vahtra, O.
9.
Vahtra, V.
10.
Vahtra, Vello
11.
Vahtra-Hellat, Anu
name of the person
4
1.
Vahtra, Katrin
2.
Vahtra, Leida
3.
Vahtra, Milvi, 1955-
4.
Vahtra, Tuuli
CV
3
1.
Vahtra, Leida 1917-2007
2.
Vahtra, Marju
3.
Vahtra, Vello 1930
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