https://openlibrary.org/works/OL342262W/Beton_tulang?edition=key%3A%2Fbooks%2FOL25662M
Beton tulang by Roosseno Surjohadikusumo, unknown edition,
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https://iprbor.com/id/contact/
Kontak Biro Oktroi Roosseno di Kantor Taman A-9, Unit C1 & C2JI. Dr Ide Anak Agung Gde Mega Kuningan, Jakarta, Indonesia. Phone +62-21-5762310 (Hunting) /...
kontakbiroroosseno