### Correspondence with Dennis Johnson

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Letter to J. Birman, undated. About simplifications to proofs (based on phone call with Joan). misc

:Letter to J. Birman, undated. About paper identifying the kernel of one of “Joan’s” homomorphisms. misc

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Letter to J. Birman, undated.
About paper enumerating __\( \mathbb{Z}_2 \)__ maps, proof that all the 4-intersection cases reduce, and material on intersection theory.
misc

Letter to J. Birman, undated.
About using relations in __\( \mathcal{I} \)__ to get symmetric homology spheres and new paper with description of __\( \mathcal{I}/\mathcal{C} \)__.
misc

Letter to J. Birman of 10 March 1977. Short description of machinery to be used in forthcoming paper. misc

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Letter to J. Birman, undated.
About paper on torsion of maps in __\( \mathcal{I} \)__.
misc

Notes for J. Birman, undated.
About the space of Casson homomorphisms for a surface __\( K_{g,1} \)__.
misc