It is mentioned that Hatherly's work is held by the Sackner Archive (cited as Ruth and Marvin Archive). -- Source of annotation: Marvin or Ruth Sackner.

A table of chronology of Portuguese concrete poetry included in this book indicates that it began in 1962 with publication of de Melo e Castro's book, "Ideogramas." The book reprints texts and correspondence from the early days of concrete poetry in Portugal. -- Source of annotation: Marvin or Ruth Sackner.

This catalogue depicts reproductions of concrete poems including "Duplicado Anulado" in its folded state, a work held by the Sackner Archive. -- Source of annotation: Marvin or Ruth Sackner.

This periodical was published in two issues. The Sackner Archive holds only issue No.2. -- Source of annotation: Marvin or Ruth Sackner.

This exhibition commemorates death of Tavares 1922-1994. -- Source of annotation: Marvin or Ruth Sackner.

This book is a history of Portuguese poetry. -- Source of annotation: Marvin or Ruth Sackner.

The pages of this pamphlet are numbered 55 to 60 and therefore the poems appear to be a component of larger publication. -- Source of annotation: Marvin or Ruth Sackner.

This book is also designated Separada da Revista Contravento No.2, probably signifying that this book was a supplement to the periodical. It includes a reproduction of the poet's most well known concrete poem, "Pendulo." -- Source of annotation: Marvin or Ruth Sackner.

This book presents a sampling of the different approaches to concrete poetry and visual art employed by De Melo e Castro. There are several rubberstamped poems reproduced in this book including one in color. -- Source of annotation: Marvin or Ruth Sackner.

Larry Wallrich, to whom this book was inscribed, was a British/Canadian bookdealer from whom the Sackners purchased a substantial amount of concrete/visual poetic works in 1979-1980. This book presents a sampling of the different approaches to concrete poetry and visual art employed by De Melo e Castro. There are several rubberstamped poems reproduced in this book including one in color. -- Source of annotation: Marvin or Ruth Sackner.