Relative efficiency of a two-hinged and a three-hinged arch . 4,:; .-^ ?4- I-- f . -. t 4 ^-4 •?f 4- -f- ^- Sfe 1- -i 4- - f-: ^ ^ ^ ?f- r -fir 4^ +- f» 4^
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Keywords: ., bookcentury1900, bookdecade1900, bookidrelativ, booksubjecttheses