no. 2
Free inverse semigroups
Séminaire Albert Châtelet et Paul Dubreil, Tome 25 (1971-1972) no. 2, Exposé no. J6, 1 p. 
@article{SD_1971-1972__25_2_A6_0,
     author = {Munn, Walter},
     title = {Free inverse semigroups},
     journal = {S\'eminaire Albert Ch\^atelet et Paul Dubreil},
     note = {talk:J6},
     pages = {J1--J1},
     year = {1971-1972},
     publisher = {Secr\'etariat math\'ematique},
     volume = {25},
     number = {2},
     zbl = {0342.20027},
     language = {en},
     url = {https://www.numdam.org/item/SD_1971-1972__25_2_A6_0/}
}
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Munn, Walter. Free inverse semigroups. Séminaire Albert Châtelet et Paul Dubreil, Tome 25 (1971-1972) no. 2, Exposé no. J6, 1 p.. https://www.numdam.org/item/SD_1971-1972__25_2_A6_0/

[1] Munn (W.D.). - Free inverse semigroups, Semigroup Forum, t. 5, 1973, p. 262-269 [Research annoucement]. | Zbl | MR

[2] Munn (W.D.). - Free inverse semigroups (Submitted to Proc. London math. Soc.). | Zbl