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Abstract for Carl Droms, Brigitte Servatius and Herman Servatius,
The Structure of Locally Finite Two-Connected Graphs

  We expand on Tutte's theory of $3$-blocks for 
     $2$-connected graphs, generalizing it to apply to infinite,
     locally finite graphs, and giving necessary and sufficient 
     conditions for a labeled tree to be the $3$-block tree of a 
     $2$-connected graph. 


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