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The proposed union of the telegraph and postal systems

Note 20 — REVIEW OF MR. GARDINER G. HUBBARD’S LETTER TO THE POSTMASTER-GENERAL ON THE EUROPEAN AND AMERICAN SYSTEMS OF TELEGRAPH.

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Manuale di Telegrafia Elettrica, di Carlo Matteucci, Torino, 1861.

Return to REVIEW OF MR. GARDINER G. HUBBARD’S LETTER TO THE POSTMASTER-GENERAL ON THE EUROPEAN AND AMERICAN SYSTEMS OF TELEGRAPH.
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