Orthogonale operatoren. : Modelling and identification with rational orthogonal basis functions / Peter S.C. Heuberger, Paul M.J. Van den Hof and Bo Wahlberg (eds.)
Orthographic projection. : An elementary treatise on orthographic projection : being a new method of teaching the science of mechanical and engineering drawing, intended for the instruction of engineers, architects, builders, smiths, masons, and bricklayers and for the use of schools / by William Binns
1899
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Orthographic view : 123D Design: Import an Svg File to Make a Pendant / Lydia Cline
African languages -- Orthography and spelling : Practical Orthography of African Languages : Bound with: Orthographe Pratique des Langues Africaines ; The Distribution of the Semitic and Cushitic Languages of Africa ; The Distribution of the Nilotic and Nilo-Hamitic Languages of Africa ; and Linguistic Analyses
Chinese -- Orthography and spelling : The grammar of Chinese characters : productive knowledge of formal patterns in an orthograhic system / by James Myers
English language -- Orthography and spelling -- Early works to 1800. : The instructor, or, Young man's best companion : containing spelling, reading, writing and arithmetic, in an easier way than any yet published; and how to qualify any person without the help of a master : instructions to write a variety of hands ... how to write letters on business or friendship : forms of indentures ... releases, &c. : also merchants' accompts, and a short and easy method of shop and book-keeping : together with the method of measuring carpenters' ... painters' work ... : likewise the practical guager made easy ... and some general observations for gardening : to which are added, the family's best companion; and a compendium of geography and astronony; also some useful interest tables / by George Fisher, accomptant