U.S. Hispanic literature often is written originally in English and then subsequently translated into Spanish and other languages, but there are some exceptions. Isabel Allende who was born in Chile but now resides in California writes in Spanish. If you do not know the title of the English translation, do a search under the Spanish title to determine whether the Library has the English translation. For example:
La casa de los espiritus by Isabel Allende has been translated from Spanish into English with the title: House of the Spirits. A title search either under House of the Spirits or La casa de los espiritus lets you determine whether the Library has the English translation.