Geometric duality
Rendiconti del Seminario Matematico della Università di Padova, Tome 38 (1967), pp. 23-26. 
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     author = {Crapo, Henry H.},
     title = {Geometric duality},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {23--26},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {38},
     year = {1967},
     mrnumber = {220638},
     zbl = {0149.25902},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_1967__38__23_0/}
}
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Crapo, Henry H. Geometric duality. Rendiconti del Seminario Matematico della Università di Padova, Tome 38 (1967), pp. 23-26. http://archive.numdam.org/item/RSMUP_1967__38__23_0/

[1] H.H. Crapo, On the Theory of Combinatorial Independence, MIT Thesis, 1964.

[2] H.H. Crapo, Structure Theory for Geometric Lattices, Rend. Sem. Mat. Univ. Padova, above. | Numdam | MR | Zbl

[3] D.A. Higgs, Strong Maps of Geometries, J. Combinatorial Theory, to appear. | MR | Zbl

[4] H. Whitney, On the Abstract Properties of Linear Dependence, Amer. J. 57 (1935), p. 509-533. | JFM | MR