diff --git a/R/readgcam.R b/R/readgcam.R
index a09dcc7..74c6b38 100644
--- a/R/readgcam.R
+++ b/R/readgcam.R
@@ -123,7 +123,8 @@ readgcam <- function(gcamdatabase = NULL,
     paramsSelectAll -> tblFinalNrgIntlAvShip -> datax -> group -> basin -> subRegion -> query -> subresource ->
     transport -> gcamdata -> half.life -> lifetime -> read.csv -> sector_1 -> steepness -> PrimaryFuelCO2Coef ->
     PrimaryFuelCO2Coef.name -> country -> grid_region -> 'io-coefficient' -> 'minicam.energy.input' ->
-    'remove.fraction' ->  state ->  subsector.name -> 'to.technology' -> coefficient -> tbl_carbon_capture_rate
+    'remove.fraction' ->  state ->  subsector.name -> 'to.technology' -> coefficient -> tbl_carbon_capture_rate ->
+    gcamdata_files
 
   basedir <- getwd()
 
@@ -815,6 +816,10 @@ readgcam <- function(gcamdatabase = NULL,
         }
       }
 
+      if(!is.null(gcamdata_files)){
+        if(
+          file.exists(gcamdata_files[["/inst/extdata/gcam-usa/calibrated_techs_dispatch_usa"]]) &
+          file.exists(gcamdata_files[["/inst/extdata/gcam-usa/A23.elec_tech_mapping_cool"]])){
       # Read in additional files
       add_techs <- tibble::as_tibble(gcamdata_files[["/inst/extdata/gcam-usa/calibrated_techs_dispatch_usa"]]) %>%
         dplyr::select(class1 = minicam.energy.input,
@@ -830,6 +835,7 @@ readgcam <- function(gcamdatabase = NULL,
         dplyr::left_join(add_techs) %>%
         dplyr::mutate(classLabel1="fuel",
                       classLabel2="technology")
+      }}
 
       if(grepl("cerf",paramsSelect,ignore.case = T)){
         tbl_comb <- tbl_comb %>%
@@ -1214,6 +1220,11 @@ readgcam <- function(gcamdatabase = NULL,
 
 
       # Read in additional files
+      if(!is.null(gcamdata_files)){
+        if(
+          file.exists(gcamdata_files[["/inst/extdata/gcam-usa/calibrated_techs_dispatch_usa"]]) &
+          file.exists(gcamdata_files[["/inst/extdata/gcam-usa/A23.elec_tech_mapping_cool"]])){
+
       add_techs <- tibble::as_tibble(gcamdata_files[["/inst/extdata/gcam-usa/calibrated_techs_dispatch_usa"]]) %>%
         dplyr::select(class1 = minicam.energy.input,
                       class2a = technology) %>%
@@ -1229,6 +1240,7 @@ readgcam <- function(gcamdatabase = NULL,
         dplyr::mutate(classLabel1="fuel",
                       classLabel2="technology")%>%
         dplyr::filter(!is.na(class2))
+      }}
 
       if(grepl("cerf",paramsSelect,ignore.case = T)){
         tbl <- tbl %>%
diff --git a/inst/extdata/devTests.R b/inst/extdata/devTests.R
index 40e5622..cb50d78 100644
--- a/inst/extdata/devTests.R
+++ b/inst/extdata/devTests.R
@@ -1,7 +1,22 @@
-#----------------------
-# EXAMPLE FOR DOCS - gcamextractor - rchart - rmap
-#----------------------
+#..........................
+# Check with releases of GCAM
+#..........................
+library(gcamextractor);
+
+# List of params in gcamextractor
+params <- gcamextractor::data_params; params
+
+# GCAM 6.0
+data <- readgcam(gcamdatabase = "C:/gcam/gcam-v6.0-Windows-Release-Package/output/database_basexdb",
+                 folder = "test_gcamv6p0")
 
+# GCAM 5.4
+data <- readgcam(gcamdatabase = "C:/gcam/gcam-v5.4-Windows-Release-Package/output/database_basexdb",
+                 folder = "test_gcamv5p4")
+
+#..........................
+# EXAMPLE FOR DOCS - gcamextractor - rchart - rmap
+#..........................
 library(gcamextractor); library(rmap); library(rchart)
 
 # List of params in gcamextractor
@@ -78,7 +93,7 @@ regionsSelect_i = NULL
 folder_i="cerf_test"
 
 # Issue #20
-paramsSelect_i = c("cerf")
+paramsSelect_i = c("elec_heat_rate_BTUperkWh")
 
 dataGCAM <- readgcam(reReadData = reReadData_i,
                      gcamdatabase = gcamdatabase_i,