For the third contributor to the recent bibliography of Americana, we must still turn to an adopted citizen, Joseph Sabin, an Englishman by birth. Various publishing enterprises of interest to the historical student are associated with Mr. Sabin’s name. He published a quarto series of reprints of early American tracts, eleven in number, and an octavo series, seven in number.[43] He published for several years, beginning in 1869, the _American Bibliopolist_, a record of new books, with literary miscellanies, largely upon Americana. In 1867 he began the publication (five hundred copies) of the most extensive American bibliography yet made, _A Dictionary of books relating to America, from its discovery to the present time_. The author’s death, in 1881,[44] left the work somewhat more than half done, and it has been continued since his death by his sons.[45] In the _Notas Para una bibliografia de obras anonimas i seudonimas_ of Diego Barros Arana, published at Santiago de Chile in 1882, five hundred and seven books on America (1493-1876), without authors, are traced to their writers. * * * * * As a second class of contributors to the bibliographical records of America, we must reckon the students who have gathered libraries for use in pursuing their historical studies. Foremost among such, and entitled to be esteemed a pioneer in the modern spirit of research, is Alexander von Humboldt. He published his _Examen critique de l’histoire de la géographie du nouveau continent_,[46] in five volumes, between 1836 and 1839.[47] “It is,” says Brevoort,[48] “a guide which all must consult. With a master hand the author combines and collates all attainable materials, and draws light from sources which _he_ first brings to bear in his exhaustive investigations.” Harrisse calls it “the greatest monument ever erected to the early history of this continent.” Humboldt’s library was bought by Henry Stevens, who printed in 1863, in London, a catalogue of it, showing 11,164 entries; but this was not published till 1870. It included a set of the _Examen critique_, with corrections, and the notes for a new sixth volume.[49] Harrisse, who it is believed contemplated at one time a new edition of this book, alleges that through the remissness of the purchaser of the library the world has lost sight of these precious memorials of Humboldt’s unperfected labors. Stevens, in the _London Athenæum_, October, 1866, rebuts the charge.[50] Of the collection of books and manuscripts formed by Col. Peter Force we have no separate record, apart from their making a portion of the general catalogue of the Library of Congress, the Government having bought the collection in 1867.[51]