Francesco Gnecchi 
Roman Coins [PDF ebook] 
Elementary Manual

When, tired of work, weary of society, worried by business, the collector withdraws into his own room; he finds there the most pleasant rest in his favourite occupation which he prefers to idleness. Never is the collector short of employment, to whatever kind of collection he may be given. First there is the work of arrangement which is infinite, then of classification, and again of cataloguing, and last of all the more serious but yet most delightful work, the most useful and durable (when one reaches it) that of study and of making notes for others, with a view to publishing in due season the results of one’s own researches.