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reference books
IT	Nachschlageliteratur; Nachschlagewerke n
patents.	Nachschlagebücher n
reference book ['ref(ə)rənsbuk]
gen.	Nachschlagewerk n; Referenzbuch n; Nachschlagebuch n; Fachbuch
IT	Leitfaden m

reference books : 5 phrases in 3 subjects

Communications	1
Construction	1
Economics	3