Spanish language

Free to read here, from Project Gutenberg.

José

Armando Palacio Valdés

Spanish

A First Spanish Reader

Erwin W. Roessler and Alfred Remy

Spanish

Spanish Tales for Beginners

E. C. Hills

Spanish

Tres Comedias

Jacinto Benavente

Spanish

An Elementary Spanish Reader

Earl Stanley Harrison

Spanish

Novelas Cortas

Pedro Antonio de Alarcón, also an audiobook

Spanish

The Spanish American Reader

Ernesto Nelson

Spanish

Neues Spanisch-Deutsches Wörterbuch

Theodor Stromer

German

Doña Perfecta

Benito Pérez Galdós

Spanish

Argentina, Legend and History

Vicente Blasco Ibáñez and others

Spanish

Diccionario Español-Bisaya

Juan Félix de la Encarnación

Spanish

Mariucha

Benito Pérez Galdós

Spanish

Modern Spanish Lyrics

E. C. Hills

Spanish

Legends, Tales and Poems

Gustavo Adolfo Bécquer

Spanish

Lecturas fáciles con ejercicios

Lawrence A. Wilkins and Max Aaron Luria

Spanish

Hossfeld's Spanish Dialogues, and Idiomatic Phrases Indispensible for a Rapid Acquisition of the Spanish Language

W. N. Cornett and C. Hossfeld

Spanish short stories

E. C. Hills

Spanish

Historia de la lengua y literatura castellana, Tomo 1

Julio Cejador y Frauca

Spanish

Pitman's Commercial Spanish Grammar (2nd ed.)

C. A. Toledano

Spanish

Libro segundo de lectura

Ellen M. Cyr

Spanish

Spanish Composition

Edith J. Broomhall

Spanish

Historia de la lengua y literatura castellana, Tomo 2

Julio Cejador y Frauca

Spanish

El trovador

Antonio García Gutiérrez

Spanish

Paginas Sudamericanas

Helen Phipps

Spanish

Diccionario Bagobo-Español

Mateo Gisbert

Spanish, Tagabawa

Cabos sueltos: Literatura y lingüística

Julio Cejador y Frauca, also an audiobook

Spanish

Antología portorriqueña: Prosa y verso

Manuel Fernández Juncos

Spanish

An Easy Introduction to Spanish Conversation

Mariano Velázquez de la Cadena

Contigo Pan y Cebolla

Manuel Eduardo de Gorostiza

Spanish