"Organ stops." . . "Organ (Musical instrument)" . . "Europe." . . . . . . . . . . "Hamilton's catechism of the organ : reprint of the 1865 edition"@en . . . . "Hamilton's catechism of the organ revised, corrected, and enlarged, with an historical introduction and a list of the principal metropolitan, country, and foreign organs"@en . . "Hamilton's catechism of the organ"@en . "Hamilton's catechism of the organ" . . . . . "Third edition of Hamilton's Catechism of the organ"@en . . "Verzeichnis" . . . . "Hamilton's catechism of the organ : revised, corrected, and enlarged, with an historical introduction and a list of the principal metropolitan, country, and foreign organs"@en . . "Hamilton's Catechism of the organ"@en . "Hamilton's Catechism of the organ" . . . . "Hamilton's cathechism of the organ"@en . "Hamilton's historical, descriptive, and practical catechism of the organ"@en . . . . . . . . . . . "Hamilton's Catechism of the organ : with an historical introduction, and a list and description of the principal organs in Great Britain, Ireland, Germany"@en . . "Hamilton's catechism of the organ : with an historical introduction, and a description of nearly two hundred and fifty organs" . . . . "Hamilton's catechism of the organ : with an historical introduction, and a list and description of the principal organs in Great Britain, Ireland, Germany, France, and Switzerland ; the whole revised, corrected, and much enlarged"@en . . "History"@en . . "Catechism of the organ" . "Hamilton's catechism of the organ : with an historical introduction, and a list and description of the principal organs in Great Britain, Ireland, Germany, France, and Switzerland" . . "Organ (Musical instrument) Europe." . . . . "Orgels." . . "Orgel." . .