1.4.0 - Converts raw content to characters by using UTF-8 encoding. 1.3.0 - The argument "na.rm" has been added to the function "all_tables". - Documentation of the function "make_period" has been corrected. 1.2.0 - The function "make_period" has been added. - The argument "timeout" has been added to main functions. - The function "all_tables" has been entirely rewritten. - Examples have been modified to pass the automated checking of CRAN. The reason of such changes is unstable responses from the NSO server. 1.1.0 - The error handling feature has been added due to a HTTP 500 error on the NSO server. - The new argument "simplify" has been added to the function "get_table_info". A user-friendly value is returned by using this new argument. 1.0.0 - Initial release