task_categories:image-to-text task_categories:text-retrieval task_categories:text-generation language:es license:cc0-1.0 size_categories:100K<n<1M format:parquet format:optimized-parquet modality:image modality:text library:datasets library:dask library:polars library:mlcroissant region:us historical magazines spain cultural-heritage hemeroteca archive bne ocr 19th-century pretraining